ML12202 MECL PLL Components Serial Input PLL Frequency Synthesizer
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1 MECL PLL Components Serial Input PLL Frequency Synthesizer Legacy Device: Motorola MC12202 The ML12202 is a 1.1 GHz Bipolar monolithic serial input phase locked loop (PLL) synthesizer with pulse swallow function. It is designed to provide the high frequency local oscillator signal of an RF transceiver in handheld communication applications. The technology is utilized allows for low power operation at a minimum supply voltage of 2.7 V. The device is designed for operation over 2.7 to 5.5 V supply range for input frequencies up to 1.1 GHz with a typical current drain of 6.5 ma. The low power consumption makes the ML12202 ideal for handheld battery operated applications such as cellular or cordless telephones, wireless LAN or personal communication services. A dual modulus prescaler is integrated to provide either a 64/65 or 128/129 divide ratio. Low Power Supply Current of 5.8 ma Typical for ICC and 0.7 ma Typical for IP Supply Voltage of 2.7 to 5.5 V Dual Modulus Prescaler With Selectable Divide Ratios of 64/65 or128/129 On Chip Reference Oscillator/Buffer Programmable Reference Divider Consisting of a Binary 14 Bit Programmable Reference Counter Programmable Divider Consisting of a Binary 7 Bit Swallow Counter and an 11 Bit Programmable Counter Phase/Frequency Detector With Phase Conversion Function Balanced Charge Pump Outputs Dual Internal Charge Pumps for Bypassing the First Stage of the Loop Filter to Decrease Lock Time Outputs for External Charge Pump Operating Temperature Range of TA = 40 to 85 C Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. NOTE: Also available is the ML12210, a 2.5 GHz version of this function. Page 1 of 11
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4 DATA ENTRY FORMAT The three wire interface of DATA pin, CLK (clock) pin and LE (load enable) pin controls the serial data input of the 14 bit programmable reference divider plus the prescaler setting bit, and the 18 bit programmable divider. A rising edge of the clock shifts one bit of serial data into the internal shift registers. Depending upon the level of the control bit, stored data is transferred into the latch when load enable pin is HIGH or OPEN. Control bit: H = data is transferred into 15 bit latch of programmable reference divider L = data is transferred into 18 bit latch of programmable divider WARNING: Switching CLK or DATA after the device is programmed may generate noise on the charge pump outputs which will affect the VCO. PROGRAMMABLE REFERENCE DIVIDER 16 bit serial data format for the programmable reference counter, R counter, and prescaler select bit (SW) is shown below. If the control bit is HIGH, data is transferred from the 15 bit shift register into the 15 bit latch which specifies the R divide ratio (8 to 16383) and the prescaler divide ratio (SW = 0 for 128/129, SW = 1 for 64/65). An R divide ratio less than 8 is prohibited. Page 4 of 11
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6 PHASE CHARACTERISTICS/VCO CHARACTERISTICS The phase comparator in the ML12202 is a high speed digital phase frequency detector circuit. The circuit determines the lead or lag phase relationship and time difference between the leading edges of the VCO (fp) signal and the reference (fr) input. Since these edges occur only once per cycle, the detector has a range of ±2π radians. The phase comparator outputs are standard CMOS rail to rail levels (VP to GND for φp and VCC to GND for φr), designed for up to 20MHz operation into a 15pF load. These phase comparator outputs can be used along with an external charge pump to enhance the PLL characteristics. The operation of the phase comparator is shown in Figures 3 and 5. The phase characteristics of the phase comparator are controlled by the FC pin. The polarity of the phase comparator outputs, φr and φp, as well as the charge pump output Do can be reversed by switching the FC pin. Page 6 of 11
7 For FC = HIGH: fr lags fp in phase OR fp>fr in frequency When the phase of fr lags that of fp or the frequency of fp is greater than fr, the φp output will remain in a HIGH state while the φr output will pulse from LOW to HIGH. The output pulse will reach a minimum 50% duty cycle under a 180 out of phase condition.the signal on φr indicates to the VCO to decrease in frequency to bring the loop into lock. fr leads fp in phase OR fp<fr in frequency When the phase of fr leads that of fp or the frequency of fp is less than fr, the φr output will remain in a LOW state while the φp output pulses from HIGH to LOW. The output pulse will reach a minimum 50% duty cycle under a 180 out of phase condition.the signal on φp indicates to the VCO to increase in frequency to bring the loop to lock. fr = fp in phase and frequency When the phase and frequency of fr and fp are equal, the output φp will remain in a HIGH state and φr will remain in a LOW state except for voltage spikes when signals are in phase. This situation indicates that the loop is in lock and the phase comparator will maintain the loop in its locked state. When FC = LOW, the operation of the phase comparator is reversed from the above explanation. For FC = LOW: fr lags fp in phase OR fp>fr in frequency When the phase of fr lags that of fp or the frequency of fp is greater than fr, the φr output will remain in a LOW state while the φp output will pulse from HIGH to LOW. The output pulse will reach a minimum 50% duty cycle under a 180 out of phase condition.the signal on φp indicates to the VCO to increase in frequency to bring the loop into lock. fr leads fp in phase OR fp<fr in frequency When the phase of fr leads that of fp or the frequency of fp is less than fr, the φp output will remain in a HIGH state while the φr output pulses from LOW to HIGH. The output pulse will reach a minimum 50% duty cycle under a 180 out of phase condition. The signal on φr indicates to the VCO to decrease in frequency to bring the loop to lock. fr = fp in phase and frequency When the phase and frequency of fr and fp are equal, the output φp will remain in a HIGH state and φr will remain in a LOW state except for voltage spikes when signals are in phase. This situation indicates that the loop is in lock and the phase comparator will maintain the loop in its locked state. The FC pin controls not only the phase characteristics, but also controls the fout test pin. The FC pin permits the user to monitor either of the phase comparator input signals, fr or fp, at the fout output providing a test mode where the programming of the dividers and the output of the counters can be checked. When FC is HIGH, fout = fr, the programmable reference divider output. When FC is LOW, fout = fp, the programmable divider output. Hence, If VCO characteristics are like (1), FC should be set HIGH or OPEN. fout = fr If VCO characteristics are like (2), FC should be set LOW. fout = fp Page 7 of 11
8 LOCK DETECT The Lock Detect (LD) output pin provides a LOW pulse when fr and fp are not equal in phase or frequency. The output is normally HIGH. LD is designed to be the logical NORing of the phase frequency detector s outputs UP and DOWN. See Figure 6. In typical applications the output signal drives external circuitry which provides a steady LOW signal when the loop is locked. See Figure 9. OSCILLATOR INPUT For best operation, an external reference oscillator is recommended. The signal should be AC coupled to the OSCin pin through a coupling capacitor. In this case, no connection to OSCout is required. The magnitude of the AC coupled signal must be between 500 and 2200 mv peak to peak. To optimize the phase noise of the PLL when used in this mode, the input signal amplitude should be closer to the upper specification limit. This maximizes the slew rate of the signal as it switches against the internal voltage reference. The device incorporates an on chip reference oscillator/buffer so that an external parallel resonant fundamental crystal can be connected between OSCin and OSCout. External capacitor C1 and C2 as shown in Figure 10 are required to set the proper crystal load capacitance and oscillator frequency. The values of the capacitors are dependent on the crystal chosen (up to a maximum of 30 pf each including parasitic and stray capacitance). However, using the on chip reference oscillator, greatly increases the synthesized phase noise. DUAL INTERNAL CHARGE PUMPS ( ANALOG SWITCH ) Due to the pure Bipolar nature of the ML12202 design, the analog switch function is implemented with dual internal charge pumps. The loop filter time constant can be decreased by bypassing the first stage of the loop filter with the charge pump output BISW as shown in Figure 7 below. This enables the VCO to lock in a shorter amount of time. When LE is HIGH or OPEN ( analog switch is ON ), the output of the second internal charge pump is connected to the BISW pin, and the Do output is ON. The charge pump 2 output on BISW is essentially equal to the charge pump 1 output on Do. When LE is LOW, BISW is in a high impedance state and Do output is active. Page 8 of 11
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11 Lansdale Semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Lansdale does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Typical parameters which may be provided in Lansdale data sheets and/or specifications can vary in different applications, and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by the customer s technical experts. Lansdale Semiconductor is a registered trademark of Lansdale Semiconductor, Inc. Page 11 of 11
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